CVE-2026-53047

Summary

In the Linux kernel, the following vulnerability has been resolved:

efi/capsule-loader: fix incorrect sizeof in phys array reallocation

The krealloc() call for cap_info->phys in __efi_capsule_setup_info() uses sizeof(phys_addr_t *) instead of sizeof(phys_addr_t), which might be causing an undersized allocation.

The allocation is also inconsistent with the initial array allocation in efi_capsule_open() that allocates one entry with sizeof(phys_addr_t), and the efi_capsule_write() function that stores phys_addr_t values (not pointers) via page_to_phys().

On 64-bit systems where sizeof(phys_addr_t) == sizeof(phys_addr_t *), this goes unnoticed. On 32-bit systems with PAE where phys_addr_t is 64-bit but pointers are 32-bit, this allocates half the required space, which might lead to a heap buffer overflow when storing physical addresses.

This is similar to the bug fixed in commit fccfa646ef36 ("efi/capsule-loader: fix incorrect allocation size") which fixed the same issue at the initial allocation site.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/22022cd8851703a58f67615a17bc7e9e8682785b
• https://git.kernel.org/stable/c/67adde6bfdfd563a54b045d59aeb9a2d90c80697
• https://git.kernel.org/stable/c/608e1f7bc9d171ab26c1fba288c97fc76363c27d
• https://git.kernel.org/stable/c/8be69e9245f805566bac68ffc8574b64735fd996
• https://git.kernel.org/stable/c/5e185330d902b12fe8e6eb4b8514b5d736d8d66d
• https://git.kernel.org/stable/c/e0e6b14995fd6fa2c0df8c712d76ab32f0694c31
• https://git.kernel.org/stable/c/ab3f7098a3a27175b91cfc947950f5c26855801b
• https://git.kernel.org/stable/c/48a428215782321b56956974f23593e40ce84b7a

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